xof711 - are you using something like suphp? Does php run as a different user to Apache? I'm going to add a fix for this that changes the perms but it should work, because 600 means it's readable by the owner. Which is why I think the script and Apache are running as different users ..

I woke up this morning and saw my home page had a forbidden file access error in the cache directory. I think the problem surfaced after the Super Cache upgrade yesterday. I deleted the cache directory and removed the plugin. I'll wait for a fix. Thank you.